Tick Control and Sheep Welfare

Key Welfare Considerations

• Ixodes ricinus (sheep tick) is the primary tick species affecting sheep welfare in the UK.
• Tick worry — the irritation and behaviour disruption from heavy tick burdens — causes welfare stress.
• Louping ill virus transmitted by ticks causes fatal neurological disease in unvaccinated sheep.
• Tick-borne fever (Anaplasma phagocytophilum) causes fever, immunosuppression, and welfare deterioration.
• Tick pyaemia causes fatal septicaemia in lambs, particularly devastating in upland systems.
• Babesiosis transmitted by ticks causes haemolytic anaemia and welfare emergency in affected sheep.
• Spring and early autumn represent peak tick activity periods requiring vigilance and preventive treatment.
• Tickicides applied by plunge dipping or pour-on formulations reduce tick burden and welfare impacts.
• Dipping welfare requires careful handling to avoid drowning risk and stress minimisation.
• Vaccination against louping ill significantly reduces neurological disease welfare burden in endemic areas.
• Habitat management including heather burning and grazing management can reduce tick habitat.
• Predator-prey relationships with deer as reservoir hosts affect tick pressure on sheep welfare.
• Acaricide resistance is emerging in tick populations, threatening long-term tick control welfare benefits.
• Integrated tick management combining vaccination, treatment, and habitat approaches achieves best welfare.
• Record-keeping of tick burden assessments and treatment outcomes supports welfare-driven tick management.